Just to throw my own experience in here, I tested positive for covid last Friday. Wasn't too surprised about it considering I attended three concerts and one PAX East-adjacent party within the span of a single week.
I'm vaccinated with J&J and have a single Moderna booster. I would say my immune system is well above average; the only time other than this I remember being substantially sick within the past decade was my senior year of college after I went without sleep for at least 40 hours.
I started with a scratchy throat on Wednesday, which developed into a sore throat and a mild fever the next day. On Friday morning my throat and fever felt even worse so I took a test and it was positive. That day was definitely the worst, though my fever was only 99.8 degrees. Saturday started off about the same but my fever started to improve towards the end of the day. By Sunday my fever was pretty much gone and my throat, while still sore, was better as well. All and all I was only really sick for a couple days. I felt much more sick the night after my first vaccine, though that was limited to a single night.
The most concerning thing for me is that my sense of smell is pretty much gone now. Not completely, but enough to the point where I can barely get a whiff of my deoderant when putting my nose right up against the stick. Most people apparently get it back within a couple weeks, but with how lucky I've been with the rest of my recovery, I hope I don't end up one of those people who lose it for a year or even more.
Assuming I get my sense of smell back before long, I don't regret my actions. I'm not the kind of person who'd avoid doing activities I enjoy to avoid the possibility of getting sick. But I also recognize I'm in a position where I can afford to get sick (I'm young, pretty healthy, and live alone) and not everyone is fortunate enough to be in that situation.